CN107299171B - Method for repairing refractory lining on side wall of blast furnace hearth and refractory lining body - Google Patents

Method for repairing refractory lining on side wall of blast furnace hearth and refractory lining body Download PDF

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CN107299171B
CN107299171B CN201610230394.9A CN201610230394A CN107299171B CN 107299171 B CN107299171 B CN 107299171B CN 201610230394 A CN201610230394 A CN 201610230394A CN 107299171 B CN107299171 B CN 107299171B
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refractory
lining
unshaped
bricks
blast furnace
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CN107299171A (en
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徐瑞图
何汝生
童小平
曹永国
梁任贵
李文博
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RUIER NON-METAL MATEIAL Co Ltd BEIJING
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RUIER NON-METAL MATEIAL Co Ltd BEIJING
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B7/00Blast furnaces
    • C21B7/04Blast furnaces with special refractories
    • C21B7/06Linings for furnaces

Abstract

The invention discloses a method for repairing a refractory lining on the side wall of a blast furnace hearth and a refractory lining body. The method comprises the following steps: manufacturing a leveling layer on the original refractory lining body of the blast furnace by adopting a first unshaped refractory; and (II) building a refractory wall on the leveling layer by using refractory bricks, and filling a second unshaped refractory material between the residual carbon bricks and the refractory wall to manufacture the heat-conducting lining body. The refractory material body comprises residual carbon bricks and a leveling layer. The side of the residual carbon bricks facing the center of the blast furnace is provided with a refractory wall made of refractory bricks, and a heat-conducting lining body made of a second unshaped refractory material is arranged between the refractory wall and the residual carbon bricks.

Description

Method for repairing refractory lining on side wall of blast furnace hearth and refractory lining body
Technical Field
The invention belongs to the field of blast furnace ironmaking, and particularly relates to a method for repairing a refractory lining on a side wall of a blast furnace hearth and a refractory lining body.
Background
In the smelting production of the iron-making blast furnace, when the residual thickness of the carbon bricks on the side wall of the hearth after being partially corroded reaches about 300mm, the furnace needs to be shut down for overhaul so as to prevent the serious accident of burning through the hearth. At present, the blast furnace overhaul method is almost that all the carbon bricks on the side wall of the hearth are removed, and due to the structural relevance, part of or even all the carbon bricks on the bottom of the furnace usually have to be removed, and the removed carbon bricks can not be reused basically because the removed carbon bricks are partially corroded and damaged in the removal process. The blast furnace manufacturer would then have to re-purchase all of the hearth bricks and other materials for re-construction as designed to obtain an almost new refractory lining for the hearth. The overhaul mode is a common method under the conditions that the economic condition of the steel enterprises is good and the production task is not particularly nervous. However, this overhaul method has the following significant disadvantages:
in fact, the carbon bricks on the side wall of the blast furnace hearth are eroded to a very uneven degree in the later period of the campaign. Except that the carbon bricks in local areas are eroded to the degree that the residual thickness is 300mm, most carbon bricks of the whole hearth are still in a relatively good state. However, the risk of burning through the hearth due to localized erosion is enormous, and no blast furnace operator is willing to take such a safety risk. Therefore, blast furnace overhaul is mostly forced in view of safety considerations, except that a small part is planned in advance.
The number of the hearth carbon bricks removed in the overhaul of the blast furnace is huge, and most of the carbon bricks actually have a considerable utilization value. The existing overhaul mode usually discards the whole materials after dismantling the materials. Especially for large blast furnaces, in order to ensure the safety of the hearth, the hearth is generally constructed by using carbon bricks with excellent quality and high price. One seat is 2500m3The carbon bricks for building the hearth of the blast furnace are nearly thousands of tons, and the manufacturing cost reaches about 2000 ten thousand yuan. The total waste causes serious waste, and a large amount of capital is needed for purchasing again, which obviously affects the economic benefit of iron-making enterprises.
Meanwhile, a great deal of time is consumed for emptying the hearth, completely removing the carbon bricks on the side wall of the hearth, partially or even completely removing the carbon bricks on the bottom of the furnace, and then building all the carbon bricks on the hearth and other matched refractory material linings again. One seat is 2500m3The time required for a blast furnace to perform such a hearth brick lining rebuild is about 55 days, and the time required for completing such a overhaul is generally 60-90 days by adding other supporting projects. In addition to the large capital costs, blast furnace shutdowns result in significant losses.
Therefore, the safe and effective method for quickly repairing the refractory material on the side wall of the blast furnace hearth has obvious significance for reserving the carbon bricks which have the utilization value in the hearth as much as possible, and simultaneously can obviously shorten the construction time.
Content providing method and apparatus
The invention aims to provide a method for quickly repairing refractory materials on the side wall of a blast furnace hearth and a corresponding refractory material lining body, so as to overcome the defects of the conventional overhaul mode. The hearth carbon brick with a certain residual thickness is fully utilized, and a safe and effective novel hearth side wall lining body which has a reasonable structure and does not bring too much water into the furnace is formed through short-time repair construction, so that the capital requirement of repair can be remarkably saved, the time required by repair construction can be obviously shortened, and considerable economic benefit is brought to iron-making enterprises.
In one aspect, the present invention provides a method for repairing a refractory lining of a sidewall of a hearth of a blast furnace, comprising the steps of: firstly, making a leveling layer on an original refractory lining body of the blast furnace by adopting a first unshaped refractory; and (II) building a refractory wall on the leveling layer by using refractory bricks, and filling a second unshaped refractory material between the residual carbon bricks and the refractory wall to manufacture the heat-conducting lining body.
The following preparation steps can be further included before the step (one): and (3) removing impurities adhered to the upper surface of the original refractory lining body of the blast furnace at the joint part of the bottom of the blast furnace and the side wall of the hearth, and removing impurities, a loose layer and a deteriorated layer adhered to the working end of the residual carbon brick.
The step (two) may include: when the leveling layer made of the first unshaped refractory material is solidified, building refractory bricks on the leveling layer to form a refractory wall body until the total height of the refractory wall body reaches the design height; and filling a second unshaped refractory material between the refractory wall body and the residual carbon bricks.
Alternatively, the step (two) may include: when the leveling course made of the first unshaped refractory material is solidified, building the refractory bricks on the leveling course to form a first section of the refractory wall body, and filling a second unshaped refractory material between the first section of the refractory wall body and the residual carbon bricks; then, building refractory bricks on the first section of the refractory wall to form a second section of the refractory wall, and filling a second unshaped refractory material between the second section of the refractory wall and the residual carbon bricks; the above steps are repeated until the total height of the refractory wall reaches the designed height.
Alternatively, the step (two) may include: coating or spraying a second unshaped refractory material on the hot surface of the residual carbon brick; and building the refractory bricks on the leveling layer to form the refractory wall until the total height of the refractory wall reaches the design height.
Alternatively, step (two) may comprise: arranging a template on the hot surface side of the residual carbon bricks, filling a second unshaped refractory material between the template and the residual carbon bricks, and removing the template after the filled unshaped refractory material has certain strength; and building the refractory bricks on the leveling layer to form the refractory wall until the total height of the refractory wall reaches the design height.
In another aspect, the invention provides a method for repairing a refractory lining of a sidewall of a blast furnace hearth. The method comprises the following steps: firstly, manufacturing a heat-conducting lining body on the eroded part of the residual carbon brick by using a second unshaped refractory material; secondly, manufacturing a leveling layer on the building position of the refractory wall body (5) on the original refractory lining body of the blast furnace by using the first unshaped refractory; and thirdly, building a refractory wall by taking the furnace inner surface of the heat-conducting lining body as a guide surface, and filling a third unshaped refractory material between the refractory wall and the furnace inner surface of the heat-conducting lining body.
Before the step (one), the following preparation steps are also included: the method is characterized in that the working end of the carbon brick on the side wall of the blast furnace hearth is corroded and the part needing to be repaired is cleaned of impurities on the upper surface of the original refractory lining of the blast furnace adhered to the joint part of the bottom of the blast furnace and the side wall of the hearth, and impurities, a loose layer and a deteriorated layer adhered to the working end of the residual carbon brick are cleaned.
The step (one) may include: and coating or spraying the second unshaped refractory material on the hot surface of the residual carbon brick.
Alternatively, the above step (one) may comprise: and arranging a template on the hot surface side of the residual carbon bricks, filling a second unshaped refractory between the template and the residual carbon bricks, and removing the template after the filled second unshaped refractory has certain strength.
The step (three) may include: when the leveling layer made of the first unshaped refractory material is solidified, building refractory bricks on the leveling layer to form a refractory wall body until the total height of the refractory wall body reaches the design height; and filling a third unshaped refractory material between the refractory wall heat-conducting linings.
Alternatively, the step (iii) may include: when each refractory brick of the refractory wall is constructed by using the furnace inner surface of the heat-conducting lining body as a guide surface, a third unshaped refractory material is coated on the contact surface of the refractory brick and the heat-conducting lining body.
Alternatively, the step (iii) may include: building refractory bricks on the leveling layer by taking the furnace inner surface of the heat-conducting lining body as a guide surface to form a first section of the refractory wall body, and filling a third unshaped refractory material between the first section of the refractory wall body and the heat-conducting lining body; then, building refractory bricks on the first section of the refractory wall to form a second section of the refractory wall, and filling a third unshaped refractory material between the second section of the refractory wall and the heat-conducting lining body; the above steps are repeated until the total height of the refractory wall reaches the designed height.
In addition, the invention also provides a refractory lining body for repairing the refractory lining on the side wall of the blast furnace hearth. The refractory lining body comprises residual carbon bricks and a leveling layer. The side of the residual carbon bricks facing the center of the blast furnace is provided with a refractory wall made of refractory bricks, and a heat-conducting lining body made of a second unshaped refractory material is arranged between the refractory wall and the residual carbon bricks.
A third unshaped refractory material can be arranged between the heat-conducting lining body and the refractory wall body.
Preferably, the refractory bricks used to construct the refractory walls are refractory bricks comprising 65% to 90% by weight of Al2O3, or refractory bricks comprising 65% to 90% by weight of Al2O3 (by weight) having a compressible fiber mat, fiber blanket and/or fiber mat bonded to the exterior of the furnace.
Preferably, the refractory bricks for building refractory walls are refractory bricks with Al2O3 content of 78-88 wt%, or refractory bricks with Al2O3 content of 78-88 wt% and compressed fiber felt, fiber blanket and/or fiber mat adhered to the furnace-facing outer surface.
Preferably, the second unshaped refractory material for manufacturing the thermal conductive lining body is a casting material or a self-flowing casting material or a ramming material or a spraying material containing 65-95 wt% of SiC, or a casting material or a self-flowing casting material or a ramming material or a spraying material containing 75-95 wt% of C and SiC.
Preferably, the third unshaped refractory is a castable or a self-flowing castable or a ramming material or a refractory mortar which simultaneously contains Al2O3 and C, SiC or any two of Al2O3 and C, SiC or only any one of Al2O3 and C, SiC.
Preferably, the first unshaped refractory material for making the leveling layer is a casting material or a self-flowing casting material or a ramming material containing Al2O3 or both Al2O3 and SiC.
Compared with the existing overhaul mode of the blast furnace hearth, the invention has the beneficial effects that:
the residual carbon bricks of the furnace hearth which are totally or partially discarded in the existing blast furnace hearth overhaul mode are utilized to the maximum extent, the resource waste is avoided, and the repair cost is saved.
When the method is adopted, the hearth does not need to be completely emptied, and all hearth carbon bricks do not need to be dismantled and rebuilt, so that the blast furnace smelting time occupied by overhaul is reduced, the construction operation cost is saved, pig iron is produced in a large amount, the purchase cost of the hearth carbon bricks is saved, and the like, and the economic benefit of iron-making enterprises can be obviously improved. One expected 2500m3The blast furnace adopting the method and the lining body of the invention can generate direct benefit of over 1800 ten thousand yuan.
Drawings
Fig. 1 shows a method of repairing a refractory lining of a blast furnace hearth side wall and a refractory lining body used according to example 1 of the present invention.
Fig. 2 shows a method of repairing a refractory lining of a blast furnace hearth side wall and a refractory lining body according to example 2 of the present invention.
FIG. 3 is a schematic illustration of the method of FIG. 2 for repairing a refractory lining of a sidewall of a blast furnace hearth and a method step for thermally conducting a liner in the refractory lining.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
< example 1>
Fig. 1 shows a method of repairing a refractory lining of a blast furnace hearth side wall and a refractory lining body used according to example 1 of the present invention.
The refractory lining according to example 1 of the present invention comprises residual carbon bricks 1 and a leveling layer 8. The leveling layer 8 can be made of, for example, a first unshaped refractory 7. A refractory wall 5 made of refractory bricks 10 is provided on the side of the remaining carbon bricks 1 facing the center of the blast furnace, and a heat conductive lining 3 made of an unshaped refractory 2 is provided between the refractory wall 5 and the remaining carbon bricks 1.
The refractory bricks 10 for building the refractory wall 5 are refractory bricks containing 65-90 wt% of Al2O3, or refractory bricks containing 65-90 wt% of Al2O3 and having a compressible fiber felt, a fiber blanket and/or a fiber mat adhered to the outside of the furnace. Al of the refractory brick 102O3The content is preferably 78 to 88% by weight.
The unshaped refractory 2 for manufacturing the thermal conductive lining body 3 is a casting material or a self-flowing casting material or a ramming material or a spraying material containing 65-95 wt% of SiC (wt%), or a casting material or a self-flowing casting material or a ramming material or a spraying material containing 75-95 wt% of C and SiC.
The first unshaped refractory (7) for manufacturing the leveling layer 8 contains Al2O3Or Al is contained in combination2O3SiC casting material or self-flow casting material or ramming material.
The method for repairing the refractory lining of the side wall of the blast furnace hearth according to embodiment 1 of the invention comprises the following steps: firstly, a leveling layer 8 is made on an original refractory lining 6 of the blast furnace by adopting a first unshaped refractory 7; after (two), for example, after the leveling course 8 is solidified, the refractory wall 5 is constructed on the leveling course 8 using the refractory bricks 10, and the unshaped refractory 2 is filled between the remaining carbon bricks 1 and the refractory wall 5 to produce the thermal conductive lining 3.
The preparation steps are as follows before the step (one): and (3) removing impurities on the upper surface of the original refractory lining body 6 of the blast furnace bonded at the joint part of the bottom of the blast furnace and the side wall of the hearth, and removing impurities, a loose layer and a deteriorated layer bonded at the working end of the residual carbon brick 1 for the part which is corroded and needs to be repaired at the working end of the carbon brick on the side wall of the blast furnace hearth.
In the step (two) of this embodiment 1, the masonry of the refractory wall 5 can be performed in the following ways or in the following ways:
when the leveling course 8 made of the first unshaped refractory material 7 is solidified, the refractory bricks 10 are laid on the leveling course 8 to form the refractory wall 5 until the total height of the refractory wall 5 reaches the design height; and filling a second unshaped refractory 2 between the first section of the refractory wall body 5 and the residual carbon bricks 1.
After the leveling course 8 is solidified, the refractory bricks 10 are laid on the leveling course 8 to form a first section of the refractory wall body 5, and an amorphous refractory material 2 is filled between the first section of the refractory wall body 5 and the residual carbon bricks 1 to form a heat-conducting lining body 3 with a corresponding height; then, the firebricks 10 are laid on the first section of the refractory wall 5 to form a second section of the refractory wall 5, and an unshaped refractory 2 is filled between the second section of the refractory wall 5 and the residual carbon bricks 1 to form a heat-conducting lining body 3 with corresponding height; the above steps are repeated until the total height of the refractory wall 5 and the thermal conductive lining 3 reaches the design height.
Firstly, coating or spraying a second unshaped refractory material 2 on the hot surface of the residual carbon brick 2; the refractory bricks 10 are then laid on the leveling course 8 to form the refractory wall 5 until the total height of the refractory wall 5 reaches the design height.
Arranging a template 9 on the hot surface side of the residual carbon brick 1, filling a second unshaped refractory 2 between the template 9 and the residual carbon brick 1, and removing the template when the filled unshaped refractory (2) has certain strength; and laying the refractory bricks 10 on the leveling layer 8 to form the refractory wall body 5 until the total height of the refractory wall body 5 reaches the design height.
The first unshaped refractory and the second unshaped refractory may be the same or different known refractories.
< example 2>
Fig. 2 shows a method of repairing a refractory lining of a blast furnace hearth side wall and a refractory lining body according to example 2 of the present invention.
Similar to the refractory lining according to embodiment 1 of the present invention, the refractory lining according to embodiment 2 of the present invention also includes residual carbon bricks 1, a thermal conductive lining 3, a refractory wall 5, and a leveling layer 8. Unlike the refractory lining according to example 1 of the present invention described above, the refractory lining according to example 2 of the present invention further includes an amorphous refractory 11. A refractory wall 5 made of refractory bricks 10 is provided on the side of the remaining carbon bricks 1 facing the center of the blast furnace, and a heat conductive lining 3 made of a second unshaped refractory 2 and a third unshaped refractory 11 are provided between the refractory wall 5 and the remaining carbon bricks 1. An amorphous refractory material 11 is located between the thermally conductive lining 3 and the refractory wall 5.
The refractory bricks 10, the first unshaped refractories 2, and the first unshaped refractories 7 are the same as those of example 1.
The unshaped refractory 11 contains Al2O3C, SiC or both Al2O3C, SiC or Al alone2O3C, SiC, or self-flowing castable, ramming mass or refractory mortar.
FIG. 3 is a schematic illustration of the method of FIG. 2 for repairing a refractory lining of a sidewall of a blast furnace hearth and a method step for thermally conducting a liner in the refractory lining.
Referring to fig. 3, the method for repairing a refractory lining of a blast furnace hearth side wall according to embodiment 2 of the present invention comprises the steps of: firstly, manufacturing a heat-conducting lining body 3 on the eroded part of the residual carbon brick 1 by using an unshaped refractory 2; secondly, manufacturing a leveling layer 8 on the building position of the refractory wall 5 on the original refractory lining 6 of the blast furnace by using the first unshaped refractory 7; and thirdly, building the refractory wall body 5 section by using the furnace inner surface 4 of the heat-conducting lining body 3 as a guide surface, and filling a third unshaped refractory material 11 between the refractory wall body 5 and the furnace inner surface 4 of the heat-conducting lining body 3.
The preparation steps are as follows before the step (one): and (3) removing impurities on the upper surface of the original refractory lining body 6 of the blast furnace bonded at the joint part of the bottom of the blast furnace and the side wall of the hearth, and removing impurities, a loose layer and a deteriorated layer bonded at the working end of the residual carbon brick 1 for the part which is corroded and needs to be repaired at the working end of the carbon brick on the side wall of the blast furnace hearth.
In the step (one) of example 2, the thermal conductive liner can be fabricated by the following two methods:
the second unshaped refractory 2 is coated or sprayed on the hot surface of the residual carbon brick 1. Or with the aid of a template. Referring to fig. 3, a form 9 is installed on the hot side of the remaining carbon bricks 1, a second unshaped refractories 2 is filled between the form 9 and the remaining carbon bricks 1, and the form is removed after the filled second unshaped refractories 2 have a certain strength.
Step (three) in example 2 can be performed in the following two ways:
directly coating the third unshaped refractory masonry. Specifically, when each of the refractory bricks 10 of the refractory wall 5 is constructed with the furnace inner surface 4 of the thermal conductive lining 3 as a guide surface, the third unshaped refractories 11 are applied to the contact surfaces of the refractory bricks 10 and the thermal conductive lining 3.
And building and filling section by section. Building refractory bricks 10 on a leveling layer 8 by taking the furnace inner surface 4 of the heat-conducting lining body 3 as a guide surface to form a first section of a refractory wall body 5, and filling a third unshaped refractory material 11 between the first section of the refractory wall body 5 and the heat-conducting lining body 3; then, the firebricks 10 are laid on the first section of the refractory wall 5 to form a second section of the refractory wall 5, and a third unshaped refractory 11 is filled between the second section of the refractory wall 5 and the heat-conducting lining body 3; the circulation is carried out until the total height of the refractory wall 5 reaches the design height. Alternatively, when each of the refractory bricks 10 of the refractory wall 5 is constructed with the furnace inner surface 4 of the thermal conductive lining 3 as a guide surface, the third unshaped refractories 11 are applied to the contact surfaces of the refractory bricks 10 and the thermal conductive lining 3.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.

Claims (19)

1. A method of repairing a refractory lining of a sidewall of a blast furnace hearth, the method comprising the steps of:
firstly, a leveling layer is made on an original refractory lining body (6) of the blast furnace by adopting a first unshaped refractory (7);
(II) masonry refractory wall body (5) on the leveling layer (8) by using refractory bricks (10), and filling a second unshaped refractory material (2) between the residual carbon bricks (1) and the refractory wall body (5) to manufacture a heat-conducting lining body (3), specifically: when a leveling layer (8) made of a first unshaped refractory material (7) is solidified, a refractory brick (10) is laid on the leveling layer (8) to form a first section of a refractory wall body (5), and a second unshaped refractory material (2) is filled between the first section of the refractory wall body (5) and the residual carbon bricks (1); then, building the firebricks (10) on the first section of the refractory wall body (5) to form a second section of the refractory wall body (5), and filling a second unshaped refractory (2) between the second section of the refractory wall body (5) and the residual carbon bricks (1); the circulation is carried out until the total height of the refractory wall body (5) reaches the design height.
2. The method of claim 1, further comprising, prior to step (one), the steps of:
and (3) removing impurities on the upper surface of the original refractory lining body (6) of the blast furnace bonded at the joint part of the blast furnace bottom and the hearth side wall, and removing impurities, loose layers and deteriorated layers bonded at the working end of the residual carbon brick (1) for the parts which are corroded and need to be repaired at the working end of the blast furnace hearth side wall carbon brick.
3. The method of claim 1 or 2, wherein step (two) comprises:
when a leveling layer (8) made of a first unshaped refractory material (7) is solidified, building refractory bricks (10) on the leveling layer (8) to form a refractory wall body (5) until the total height of the refractory wall body (5) reaches the design height;
a second unshaped refractory (2) is filled between the refractory wall (5) and the residual carbon brick (1).
4. The method of claim 1 or 2, wherein step (two) comprises:
coating or spraying a second unshaped refractory material (2) on the hot surface of the residual carbon brick (2);
and building the refractory bricks (10) on the leveling layer (8) to form the refractory wall body (5) until the total height of the refractory wall body (5) reaches the design height.
5. The method of claim 1 or 2, wherein step (two) comprises:
arranging a template (9) on the hot surface side of the residual carbon brick (1), filling a second unshaped refractory (2) between the template (9) and the residual carbon brick (1), and removing the template when the filled unshaped refractory (2) has certain strength;
and building the refractory bricks (10) on the leveling layer (8) to form the refractory wall body (5) until the total height of the refractory wall body (5) reaches the design height.
6. A method of repairing a refractory lining of a sidewall of a blast furnace hearth, the method comprising the steps of:
firstly, manufacturing a heat-conducting lining body (3) on the eroded part of the residual carbon brick (1) by using a second unshaped refractory (2);
secondly, manufacturing a leveling layer (8) on the building position of the refractory wall body (5) on the original refractory lining body (6) of the blast furnace by using a first unshaped refractory (7);
thirdly, building a refractory wall body (5) by taking the furnace inner surface (4) of the heat-conducting lining body (3) as a guide surface, and filling a third unshaped refractory material (11) between the refractory wall body (5) and the furnace inner surface (4) of the heat-conducting lining body (3), specifically: building refractory bricks (10) on a leveling layer (8) by taking the furnace inner surface (4) of the heat-conducting lining body (3) as a guide surface to form a first section of a refractory wall body (5), and filling a third unshaped refractory material (11) between the first section of the refractory wall body (5) and the heat-conducting lining body (3); then, building the refractory bricks (10) on the first section of the refractory wall body (5) to form a second section of the refractory wall body (5), and filling a third unshaped refractory material (11) between the second section of the refractory wall body (5) and the heat-conducting lining body (3); the circulation is carried out until the total height of the refractory wall body (5) reaches the design height.
7. The method of claim 6, further comprising, prior to said step (one), the following preparatory steps:
the method is characterized in that the working end of the carbon brick on the side wall of the blast furnace hearth is corroded and the part needing to be repaired is cleaned, impurities on the upper surface of the original refractory lining body (6) of the blast furnace, which is bonded at the joint part of the bottom of the blast furnace and the side wall of the hearth, and impurities, a loose layer and a deteriorated layer, which are bonded at the working end of the residual carbon brick (1), are cleaned.
8. The method of claim 6 or 7, wherein step (one) comprises:
and coating or spraying the second unshaped refractory (2) on the hot surface of the residual carbon brick (1).
9. The method of claim 6 or 7, wherein step (one) comprises:
a formwork (9) is provided on the hot side of the remaining carbon bricks (1), a second unshaped refractory (2) is filled between the formwork (9) and the remaining carbon bricks (1), and the formwork is removed when the filled second unshaped refractory (2) has a certain strength.
10. The method of claim 6 or 7, wherein the step (three) comprises:
when a leveling layer (8) made of a first unshaped refractory material (7) is solidified, building refractory bricks (10) on the leveling layer (8) to form a refractory wall body (5) until the total height of the refractory wall body (5) reaches the design height;
third unshaped refractory (11) is filled between the refractory wall (5) and the heat-conducting lining bodies (3).
11. The method of claim 6 or 7, wherein the step (three) comprises:
when each refractory brick (10) of a refractory wall (5) is constructed with the furnace inner surface (4) of a heat conductive lining body (3) as a guide surface, a third unshaped refractory (11) is coated on the contact surface between the refractory brick (10) and the heat conductive lining body (3).
12. A refractory lining obtained by the method according to claim 6, comprising residual carbon bricks (1) and a leveling layer (8),
a refractory wall body (5) made of refractory bricks (10) is arranged on the side of the residual carbon bricks (1) facing the center of the blast furnace, a heat-conducting lining body (3) made of a second unshaped refractory material (2) is arranged between the refractory wall body (5) and the residual carbon bricks (1), and a third unshaped refractory material (11) is further arranged between the heat-conducting lining body (3) and the refractory wall body (5).
13. A refractory lining body as claimed in claim 12, wherein: the refractory brick (10) for building and manufacturing the refractory wall body (5) contains 65 to 90 weight percent of Al2O3The refractory brick is made of 65-90% of compressible fiber felt, fiber blanket and/or fiber mat adhered to the surface facing the furnaceAl in weight percent2O3The refractory brick of (1).
14. A refractory lining body as claimed in claim 12, wherein: the refractory bricks (10) for building the refractory wall body (5) are Al2O3Refractory brick in an amount of 78-88 wt.%, or Al with compressible fiber mat, fiber blanket and/or fiber mat adhered to the outside of the furnace2O3Refractory brick with content of 78-88 wt%.
15. A refractory lining body as claimed in claim 12, wherein: the second unshaped refractory (2) for manufacturing the heat-conducting lining body (3) is a castable, a ramming material or a spray coating containing 65-95 wt% of SiC, or a castable, a ramming material or a spray coating containing 75-95 wt% of C, or a castable, a ramming material or a spray coating containing 75-95 wt% of the sum of the C content and the SiC content.
16. A refractory lining body as claimed in claim 12, wherein: the third unshaped refractory (11) contains Al2O3C, SiC or both Al2O3C, SiC or only one of Al2O3 and C, SiC, and is made of casting material, ramming material or refractory mortar.
17. A refractory lining body as claimed in claim 12, wherein: the first unshaped refractory (7) for making the leveling layer (8) contains Al2O3The casting material or the ramming material.
18. Refractory lining according to claim 17, characterized in that the first unshaped refractory material (7) of which the leveling layer (8) is made is of a material which at the same time contains Al2O3And SiC casting material or ramming material.
19. A refractory lining as claimed in any one of claims 15 to 18 wherein a self-flowing castable material is used when the preparation of the first, second and third unshaped refractories is applied to the castable material.
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CN102706161A (en) * 2012-05-09 2012-10-03 江西中烨高新技术有限公司 Construction technology for preparing kiln lining by compounding ceramics and unshaped refractory materials

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